Key takeaways
- Side effects at 20–30 mg/day are uncommon and mild: nausea, dry mouth, headache, appetite changes.
- Avoid high doses in pregnancy; large amounts may stimulate the uterus.
- Use caution with antidepressants, blood thinners, blood-pressure and diabetes medication.
- People with bipolar disorder should avoid saffron unless a psychiatrist approves.
Common Side Effects
Across trials at 20–30 mg/day, side effects occurred at rates similar to placebo. When they do occur, they are usually mild:
| Side effect | How common | Tip |
|---|---|---|
| Nausea or upset stomach | Occasional | Take with food |
| Dry mouth | Occasional | Stay hydrated |
| Headache | Occasional | Try a lower dose |
| Change in appetite | Occasional | Usually reduced appetite |
| Drowsiness or restlessness | Uncommon | Adjust timing (evening vs morning) |
| Allergic reaction | Rare | Stop and seek care; more likely if allergic to Lolium, Olea or Salsola pollens |
Rare and Serious Effects
At very high doses (several grams, far beyond any supplement), saffron can cause vomiting, bleeding, dizziness, numbness and yellowing of the skin and eyes. Doses of 5 g or more have been described as toxic. A one-week study found minor changes in some blood measures at 400 mg/day (Modaghegh 2008). Stick to research doses.
Who Should Avoid Saffron Supplements?
Saffron Drug Interactions
| Medication type | Examples | Concern |
|---|---|---|
| Antidepressants (SSRIs, SNRIs, MAOIs, TCAs) | Sertraline, fluoxetine, venlafaxine | Possible additive serotonin effect. Some trials combined them under supervision. |
| Blood thinners & antiplatelets | Warfarin, apixaban, clopidogrel, aspirin | May increase bleeding risk at high doses |
| Blood-pressure medication | Amlodipine, lisinopril | May add to blood-pressure lowering |
| Diabetes medication | Metformin, insulin | May slightly lower blood sugar; monitor levels |
| Sedatives | Benzodiazepines, sleep aids | Possible additive drowsiness |
| Other serotonergic supplements | 5-HTP, St John's wort, SAMe | Avoid stacking without medical advice |
This list isn't complete. Always show your pharmacist the supplement bottle.
The Hidden Risk: Adulteration
Saffron is so expensive that fake and "cut" saffron is common in the spice trade. Bulking agents have included safflower, marigold, turmeric, dyed corn silk and synthetic dyes. With supplements, the safest approach is to buy branded extracts (affron®, Satiereal®) or products from manufacturers with third-party testing. See our buying checklist.
Check Your Situation
Use the free saffron safety checker to see which of these points apply to you, then take the results to your doctor or pharmacist.
Frequently Asked Questions
What are the negative effects of saffron?
At normal supplement doses, side effects are uncommon and mild: nausea, dry mouth, headache, appetite changes and occasionally drowsiness. Serious effects have only been reported at doses many times higher than supplements contain.
Is saffron hard on the liver or kidneys?
Studies at normal doses have not shown liver or kidney harm, and some animal research suggests protective effects. If you have liver or kidney disease, ask your doctor first.
Can saffron cause anxiety?
It is uncommon. Trials more often found saffron reduced anxiety. A few people report restlessness. Taking it earlier in the day may help.
Is saffron safe to take with sertraline?
Only with your doctor's approval. Saffron may affect serotonin, so combining it with sertraline or other SSRIs needs medical supervision.
Can saffron cause bleeding?
Only at very high doses. If you take blood thinners or have a bleeding disorder, discuss saffron with your doctor.
Research & Sources
- Modaghegh MH, et al. Safety evaluation of saffron (Crocus sativus) tablets in healthy volunteers. Phytomedicine. 2008;15(12):1032-1037.
- Schmidt M, Betti G, Hensel A. Saffron in phytotherapy: pharmacology and clinical uses. Wien Med Wochenschr. 2007;157(13-14):315-319.
- Marx W, et al. Effect of saffron supplementation on symptoms of depression and anxiety. Nutr Rev. 2019;77(8):557-571.
- Lopresti AL, et al. Affron® for youth anxiety and depressive symptoms. J Affect Disord. 2018;232:349-357.